“When a person will have in the skin of his flesh a spot of intense whiteness …he shall be brought before Aharon the Kohen, or to one of his sons the Kohanim. The Kohen shall look at the affliction…it is a tzora'as affliction. The Kohen shall examine it and declare him contaminated.” 13:2.3
- To Aharon the Kohein etc. - It is a Scriptural decree that the declaration of the impurity of skin lesions and their purification is only by authority of a Kohen.” – Rashi
One of the primary causes of tzora’as is the spread of slander, a hateful act that triggers disunity among the Jewish people. The job of the Kohen is to assist the people in their quest for spiritual perfection and unify them under the banner of Torah and Heavenly service. Perhaps this is symbolized by the fact that only the Kohen is fit to pronounce a verdict of contamination by virtue of having disseminated harmful speech. Only with the assistance of the Kohen whose specialty is promoting unity amongst Jews will this person achieve proper Teshuvah and repair the damage done through his actions.